Wood chipper



Aug. M, i923. lig@ D. c. ANDREWS WOOD CHIPPER Filed March 23. 1923 INVENTOR.

uiuirasrars narrar DENNIS C.ANDREWS, GF CLOQUET, MNNESOTA Vwoop, ciiirrnia.

Application lied 'March 23 To @ZZ whom t may concern Be it known that I, DENNIS C.' ANDREWS,

a citizen of the UnitedStates, residing at Cloquet, in the county of Carlton, State of'v Minnesota, have invented certain new and useful Improvements in Wood Shippers;

and I do hereby. declare the` following to be a full, clear, and, exactdescription 'of the invention, such as will enableotheis skilled in the art to which itf 'appertainsto jmayke and use the same.

rlhis invention relates Vto improvements in wood chipping machines" of the type coinmonly used for the purpose of cutting wood into chips preparatory-to making pulp therefrom. 'l/Vood chipping machines of this gen eral type comprise a 'rotatable discl carrying onefor more knives, a feeding spoutor trough adapted Vto bring thewood into Acon tact with the rotatable disc, and a stationary knife .arranged so. that itV may coact with theknife or kniveson the rotatable discto cut Aoff or shear' chips from the wood.

During the normal use of wood chipping machines o f the type above described, considerable wear takes place in the immediate vicinity .of tlieeuttingknives and the lower end of the vfeeding spout. This wear is caused by the threshing aroundxor pounding ofthe wood within the spout, dueto the rotating knives striking the wood. In orden to Aprevent excessive wear of the feeding'y fspout proper, it has4 been found advisable heretofore to provideV a removable wear plate near the lower end of the feedingspout, this wear plate being securedto the spout by means of bolts passing through the plate and spout.` After the plate hasjbecome considerablyfworn, it is necessary to remove the bolts in ordeijtohreplace the wear plate with anew one. This operation of `renew- V ingthe wear plate involves not only-theel;-

pense of replacing the wear. memberjwithan entirely .new one, but also` the expense resulting from the interruption in the oper'- ation of the machine.

Another disadvantage of theV wood chip-i" pers now inY general use, lies inthe fact that' the wear plate and stationary knifeforrn separate partsof the `chipping machine.v 'The wear .plateextends into closeproxim ity` to the stationaryknife in order that it may form a support for the wood in the feeding spout when the chipping or cutting is taking place but no matter how nice the adjust- 1923. Serial No. 627,008.

ment of the various parts.. it is not possible to avoid the presence of at least a small gap Y knife.V TWhen eveii aV small gap is present at this point, a relatively large number of slivers and a considerable quantity of .iiie wood dust are produced. rlhis is caused by the splitting of the wood adjacent to this gap, due to the lack of support at this point while the cutting is taking place. rlie pres` ence of slivers and wood dust in the chips makes it impossible to produce pulp of the best grade, and it is therefore desirable to limit as much as possible the production of these undesirable constituents.

t @ne of the principal objects of this invention is to provide aweod chipper wherein no gap at all is formed betweenthe stationary cutting edge and the wear member. This object may be attained by providing abutting tool of such construction that it has not only a Vcutting edge but also a portion adapted to serve as a wear member, and providing a spout having a continuous surface extending into direct contact with Ythe cutting took The portion of the cutting tool or knife adapted to serve as a wear member takes the place of the wear plate now incommon use. Y

Thisiinvention may be best `understood by referring to the following detailed description which is to be considered in conjunction withthe accompanying drawings in which: f

-Fig lT is an elevation of the improved wood'chipping machine, certain parts being brokenA away to show the details of construction. Y

Fig. is a longitudinal vertical section taken on line 2-2 of Fig. l.

F ig. 3 is an enlarged section view of the feeding. spout, stationary knife and associated. parts, shown in Fig. 2.

Fig. a.' is a plan view of the improved stationary knife; and

Fig. 5 is an end elevation of the stationary knife shownin Fig..4t.

The embodiment of the invention shown in the accompanying4 drawing comprises a rotatable dise l mounted on a shaft 2 and driven by any suitable source of energy (not 3, shown in the drawing, projects out from thevsurface of the disc l; and the distance between the cuttingl edgeV ot thelnni'e and the disc l determine the thickness ofthe chips produced; A casingV 4t encioses the lupper portion of the'1 disc '1,' andtheA lower the axis i andinclincd at an angle to the horizontalplanethrough this axis; projects Y through the casing i into close proximity to the disc l. This spout G may be iinedto the bed plated? by means oit suitable bolts. 8.

` ofthe hand Wheel l2.

supported by keeper-s lt fined tothe under-4`V sid`ef-o'f=tlie'sg iout 5. [Thisfo'ar is adapted to :The particular spout illustrated in the draw-j ing is circular,A however, it isobyioiis thata "l" l l *)1\ section may Le emp oycc rihc improved stationary `knife 9 is sup- '1 ported at substantially right'anglestothe dis'cfl bythe bed plate 7,` 'and isada'pted to bendvanced Vor retracted by;incans oi ad? justing screws l0, l0, whii slot connection with 'the l;

pe. (Seo Fig. i.)

j These screws lOcng-age scieui'tlirnds inithe bled' plfateg andthe.screws-may be lined in anydesired positioirby clampingthe bloei; 'ilr tightly Vagainst them. rilhis block 1 1 may be c lampedfin piace byV ineansof'a central boltz passing; through thisV block and into the 'i be forced againsttlie upper.tace/iiI stal.

tionary ltni'le Shy turning' the eccentric i5,

A located'fat' the upper end oi'ithe bar.V This eccentric l5 is'lpivoted 'on aVV suitable support carried by the spout and-itis adapted to. be fixed inany desired Vposition by means 'oit the' set* screw 16;V

W'hcn the stationary cutting'- tool-9 moved by merely loosening the Veccentric 15 beyeled upper blunt edcjc the desired inclina'- A-tion so that'iyhenthe tool is again placed infposition in: the machine this edgewill termini. continuation ci" the feeding' spoutL It is therefore evident- Vthatv the in'iproyed' eri may be kept in excelleiity'vorln ving; condition With afiniu'iinuni ofexpense.

Wood chi] `ThelWearlfi'iiembei does nothaye be replacedby fa. new part iis The improvedy cutting* tool or "stationary incenso Y distance from thecutting,- edge of the knife spoiitof rectangularor other suitable' cross'- l of thatoidinarilyproduced," bed plate, this bolt being turned by ineens AWedgingr bar lf3 is has become Worn orndull it may readily bere-'- be termed'an obtuse toolAangie-thatisfthe f tangentV o'lVv the angle betiveenthe lower Vacner face oi' the ifeeding spout]thisbeing o. rlhe point-'oilJ conif clearly shown iii Fi tact between tlie"innei"'iiace of the spontaner the cutting tool ci' lrniie 9jisV aticonsideiabie Thereioi'e, rthe thrashing` or pounding ofthe Woodin the vfeeding spout doesQnotphave a3 tendencyto producela.'gap betweenthese f parts; and `even iiisuch a gap were produced" it would havenoj eii'ect on vthe cuttingo'fthe Wood, for the Wood-is firmly' supported .at

the lpointfoi cutting'by thev upper actiy'e *b have a bali and I l have found that Wood may be reduced to chips much moreciiiciently when niyiinib proved Wood chipper is used;than"when ordinary V,Wood `chipper isV einployedl 1 n,

tact, when the improvedchippcr is used, Vthe Y amount ofjWaste'piodiicedis only. o ne'iiithl the 1 amount oit wood dust beingapproximatelyoneeqnari ter ofthe'jainount oi' dust prodiilced bythe ordina-ry Wood chipper. fifhcrefore, when theimproyedwood chipperis used, itis possible toproduce Wood vpulpoitmuch superior,Y

quality toaiiy pulpk which` be inade from the class' described?,saidjlrnife beingadapted sp'oiitf and i' a lcutting` knifeYAattached to* 1; 112'0 V 'rotatable disc; a stationary'lrnfifc liavingan; isthecaseWith-thc wood'cliippersnow in vcommon use and' the opeiatoriinay be cei'tain'l'hat as long as the Y Ycutting V'edge is sharp, the portionV ot the toolsei'yin'g a YWear member is-also" Vin propercondition.

Istatiouary knife beingn arranged v Y a, snbstantiallytiig'ht anglestosaid discxf v In a ivood chipper haying afeedingV spout and'a cutting -kiiite` attached to rotatable disc, unitary in'i'eml'ier having* ai .cutting edpeand ajjpoiition forming a ccnl:Y` tinualtion oi'fthe fee ienV being removably and adjustably mounted atthe deliver;7 end of the feeding spout at substantially right angles to saiddisc.

4C. In a- Wood chipper having a cutting knife Yattached to a rotatable disc,v a stationary cutting knife arranged at .substantially right anglesV to said discV and having its upper front edge beveled, andV ayfeeding spout having the inner surface thereof eX- tendinginto direct eontactwvith said stationarv knife, the upperbeveled edge of said Y stationary knife forming -a continuation of said feeding spout.

5. In a Wood chipperhaving a cutting knife attached to a rotatable disc, a station- `ary cutting knife arranged at substantially arranged at substantially right angles to said rotatable disc, a feeding spout having the inner surface thereof extending into dif rect Contact with said stationary knife, and means for adjusting VVsaid stationary knife toward and away from said disc, said stationary knife having a beveled edge forining a continuation of said feeding spout.

In testimony whereof I aiiix my signature.

. DENNIS C. ANDREVS. 

